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30 heads of 18-month aged Simmental cross breed cattle were slaughtered to investigate the postmortem behavior of bioimpedance of beef muscle and relationship between bioimpedance and pH value of the muscle,Longissimus dorsi (LD) muscle samples excised from carcasses right after slaughtering cattle.Samples were stored at temperature of close to cryotic point (1*~-1℃) for ten days experiment.The first group of samples were tested at 3h right after slaughter,the following samples were tested every 24h.The last group were tested at 216h (10th day) afier slaughter.